Skip to main content

CONSTRUCTED WETLAND IN RIVER WATER QUALITY IMPROVEMENT

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial

Abstract:

A pilot-scale wetland was constructed next to the bank of a discharge to study the feasibility of water quality improvement. The wetland is 25 m long and 6 m wide with impermeable underlay, has two parallel channels. Each channel (1.98 m wide on top, 0.45 m at bottom, and 0.5 m high) was packed with rocks and had working volume of 19.2 m3 and porosity of 0.457. This subsurface flow system was operated for two dry seasons from Nov., 1998 to May, 1999 and Nov., 1999 to May, 2000.

Two channels received identical flow rate except that different plants might grow on each channel. Flow rates tested were from 1.7 to 127.6 m3/d in each channel, and this gave hydraulic retention times (HRTs) of 120 to 1.6 hours. Organic loading rates (OLRs) ranged from 0.002 to 0.219 kg TCOD/m3-d. Results indicated that removal rates of suspended solids (SS) ranged from 53.1–63.5%, with similar results for volatile SS (55.3 to 58.5%). This means physical filtration was the predominant removal mechanism. Removal rates of total COD (Chemical Oxygen Demand) in both channels were similar (37.9–38.7%). That soluble COD was not removed as effectively as total COD suggested physical filtration was more significant than biological transformation in the wetland. Higher BOD (Biochemical Oxygen Demand) removal rates than total COD or soluble COD indicated some CODs were not quite biodegradable. Experiences in operation and maintenance of constructed wetland concluded that a design of backwash was necessary, and frequent harvest of plants was necessary in order to achieve better nitrogen and phosphorus removal rates.

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864700784547313

Publication date: January 1, 2000

More about this publication?
  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • ingentaconnect is not responsible for the content or availability of external websites
wef/wefproc/2000/00002000/00000007/art00047
dcterms_title,dcterms_description,pub_keyword
6
5
20
40
5

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more